Disazo pigments



nited States Patent ffice Patented Nov. 26, 1968 3,413,279 DISAZO PIGMENTS Willy Mueller, Riehen, Switzerland, assignor to Ciba Limited, Basel, Switzerland No Drawing. Filed Jan. 18, 1966, Ser. No. 521,435 Claims priority, applicatggr/iwitzerland, Jan. 25, 1965,

8 Claims. (Cl. 260-176) ABSTRACT OF THE DISCLOSURE Disazo compounds of the formula C 0 CH3 (1) KB: 0 0 CH3 erably being a phenylene or diphenylene residue and especially a residue of the formula in which X represents a hydrogen or halogen atom or an alkyl or alkoxy group, Y represents a hydrogen or halogen atom or an alkyl, alkoxy, trifluoromethyl or cyano group and Y represents a hydrogen or halogen atom in which A and B represent arylene residues, R represents a benzene residue, R represents an alkyl, cycloalkyl, aral kyl or aryl residue and X represents an oxygen or sulphur atom-and in which the group XR is in orthoor para-position to the NH group and the trifluoromethyl group is in meta-position to the NH group are valuable yellow pigments having an outstanding fas'tness to light.

The present invention is based on the observation that valuable disazo pigments of the formula I I COCHs in which A and B represent arylene residues, R represents a benzene residue, R represents an alkyl, cycloalkyl, aralkyl or aryl residue and X represents an oxygen or sulphur atom and in which the group XR is in orthoor para-position to the NH group and the trifluoromethyl group is in meta-position to the -NH group, are obtainable when (a) a dihalide of a dicarboxylic acid of the formula OOCHS GOCHa HO 0 OBN=NOHO GNH-A-NHC 0 CHN=NBCOOH is condensed in a molar ratio of 1:2 with an a minobenzene of the formula FaC 1-NH2 or (b) a diazo compound of an amine of the formula |Rz F3CRi-NHCOBNH2 is coupled in a molar ratio of 2:1 with a diacetoacetylarylenediamine of the formula Because the products of the invention are pigments they must not contain groups imparting solubility in water particularly acidic groups imparting solubility in water, for example, sulphonic acid or carboxylic acid groups.

The dicarboxylic acids of the Formula 2 may be advantageously obtained by coupling a diazo compound of a monocarboxylic acid of the formula HOOC-BNH in which B preferably represents a benzene residue, with a diacetoacetylarylenediamine of the Formula 5 in a molar ratio of 2:1, the arylene residue A in the Formula 5 pref- The compounds of the Formula 5 may be coupled with diazotized aromatic aminocarboxylic acids, preferably aminobenzenecarboxylie acids, especially those of the formula NI-Ig COOH in which Y represents a hydrogen or halogen atom or an alkyl, alkoxy or c-arbalkoxy group and n. represents 1 or 2. The following aminocarboxylic acids may be mentioned as examples: 3-aminobenzoic acid, 4-aminobenzoic acid,

3-chloro-4-aminobenzoic acid, 4-chloro 3 aminobenzoic acid, 4-bromo-3-aminobenzoic acid, 4-fiuoro-3-aminobenzoic acid, 2,4-dichloro-5-aminobenzoic acid, 3-methyl-4- aminobenzoic acid, 4-methyl-3-aminobenzoic acid, 2,4-dimethyl S-aminobenzoic acid, 4-methoxy-3-aminobenzoic acid, 3-nitro-4-aminobenzoic acid, B-amino-terephthalic acid methyl ester and 3-amino-terephthalic acid ethyl ester.

The azodicarboxylic acids of the formula (2) may be treated with substances capable of converting carboxylic acids into their halides, for example, their bromides or chlorides. Thus phosphorus halides, for example, phosphorus trichloride, phosphorus pentachloride or phosphorus oxychloride, but especially thionyl chloride may be used. The treatment with the acid halogenating agents of the kind defined is advantageously carried out in an inert organic solvent, for example, in a chlorobenzene, for example, monochlorobenzene or a dichlorobenzene, toluene, xylene, benzene or nitrobenzene. When using thionyl chloride as acid chlorinating agent, it has been found to be advantageous to carry out the process in the presence of a dialkyl formamide, especially dimethyl formamide.

When preparing the carboxylic acid halides it is advantageous first to dry the azo compounds which have been prepared in an aqueous medium, or to free them from Water by azeotropic distillation in an organic solvent. If desired, this azeotropic drying may be carried out immediately prior to the treatment with the acid halogenating agents.

The dicarboxylic acid halides so obtained are reacted with aminobenzenes of the formula |Rz F3C-R -N];Iz

especially with those of the formula in which R and X have the meanings given above. The following examples may be mentioned:

2-methoxy-5-trifiuoromethylaniline,

2,4-dimethoxy-5-trifiuoromethylaniline,

2-ethoxy-S-trifiuoromethylaniline,

2-n-propoxy-S-trifluoromethylaniline,

2-isopropoxy-S-trifluoromethylaniline,

2-cyclohexyloxy-S-trifiuoromethylaniline,

2-phenoxy-S-trifiuoromethylaniline,

2-(ortho-methylphenoxy)-5-trifluoromethylaniline,

2- (para-methylphenoxy -5-trifluoromethylaniline,

2- (para-methoxyphenoxy -5-trifiuoromethylaniline,

2- (ortho-chlorophenoxy -5-trifiuoromethylaniline,

2- (para-chlorophenoxy -5-trifluoromethylaniline,

2- (para-bromophenoxy)-5-trifiuoromethylaniline,

2- (2,4-dichlorophenoxy)-5-trifiuoromethylaniline,

2- a-naphthoxy -5-trifiuoromethylaniline,

Z-(fl-naphthoxy) -5-trifiuoromethylaniline,

2- (para-diphenyloxy)-S-trifluoromethylaniline,

2- 2',4',5-trichlorophenoxy -5-trifluoromethylaniline,

2- (2,3',4,5,6-pentachlorophenoxy) 5-trifiuoromethylaniline,

Z-methylmercapto-S-trifluoromethylaniline,

Z-phenylmercapto-S-trifiuoromethylaniline,

2- (para-methylphenylmercapto -S-trifiuoromethylaniline,

2-(para-chlorophenylmercapto)-S-trifiuoromethylaniline,

4-methoxy-5-trifiuoromethylaniline,

4-phenoxy-5-trifluoromethylaniline,

4- (para-chlorophenoxy) -3-trifiuoromethylaniline,

4-(ortho-methylphenoxy)-3-trifluoromethylaniline and 4-(para-methylphenoxy)-3-tri.fluoromethylaniline.

The condensation of the carboxylic acid halides of the kind defined above with the amines is advantageously carried out in an anhydrous medium. Under these conditions it proceeds surprisingly easily, even at temperature within the boiling range of the common organic solvents, for example, toluene, monochlorobenzene, dichlorobenzene, trichlorobenzene and nitrobenzene. To accelerate the re action it is generally advantageous to use an agent capable of binding acid, for example, anhydrous sodium acetate or pyridine. Some of the products obtained are crystalline and some are amorphous. Most of them are obtained in a vrey good yield and in a pure state. It is advantageous first to separate the carboxylic acid chloride obtained. In some cases, however, isolation of the acid chlorides can be omitted without harm and condensation carried out immediately after the preparation of the acid chlorides.

In method (b) of the process of the invention, a diazo compound of an amine of the formula (4) is coupled in a molar ratio of 2:1 with a diacetoacetyl-arylenediamine of the formula (5). It is advantageous to use diazo com pounds of amines of the formula in which R X, Y and n have the meanings given above.

Coupling is preferably carried out in a slightly acid medium, advantageously in the presence of a substance generally used to assist coupling, particularly dispersing agents, for example, aralkyl sulphonates, for example, dodocylbenzene sulphonate or 1,l'-dinaphthylmethane- 2,2-disulphonic acid or polycondensation products of alkylene oxides. The dispersion of the coupling compo nent may also advantageously contain protective colloids, for example, methylcellulose or small amounts of an inert organic solvent that is sparingly soluble or insoluble in water, for example, aromatic hydrocarbons that may be halogenated or nitrated, for example, benzene, toluene, xylene, chlorobenzene, dichlorobenzenes or nitrobenzene, as well as aliphatic halogenated hydrocarbons, for example, carbon tetrachloride or trichloroethylene, and also organic solvents miscible with water, for example, acetone, methylethylketone, methanol, ethanol or isopropanol.

Coupling may also advantageously be carried out in such manner that an acidic solution of a diazonium salt is continuously coupled with an alkaline solution of the coupling component in a mixing nozzle, whereby coupling takes place instantaneously. Care must be taken to ensure that the diazo component and coupling component are present in the mixing nozzle in equimolecular proportions, but in some cases it has been found to be advantageous to use a small excess of the diazo component. The simplest way to do this is by control of the pH value of the liquid in the mixing nozzle. Care must also be taken to ensure that the two solutions are in a state of turbulence in the mixing nozzle. The dyestuff dispersion thus formed is drawn off from the mixing nozzle continuously and the pigment is isolated by filtration.

The new products are valuable yellow pigments that are distinguished by an exceptionally high degree of light fastness and may be used for a very wide variety of purposes. For example, they may be used in a state of fine division for the spin-dyeing of cellulose ethers and esters, polyamides, polyurethanes and polyesters, as well as in the preparation of colored lacquers and as lake formers. They may also be used for coloring solutions and products made from cellulose acetate, nitrocellulose, natural and synthetic resins, for example, polymerization and condensation resins, for example, aminoplasts, alkyd resins, phenoplasts, polyolefines, for example, polystyrene, polyvinyl chloride, polyethylene, polypropylene, polyacrylonitrile, rubber, casein, silicones and silicone resins. They the dropwise addition has been completed, disappears comcan also be used with advantage in the preparation of pletely after the batch has been warmed for a short period colored pencils, cosmetic preparations and laminated sheet at 30 to 35 C. The batch is then heated to 80 to 85 C. material. during one hour, filtered while hot, and the filter residue Compared with the pigments described in German 5 is washed free from salt with hot water. The residue is patent specification No. 1,150,165 (Case 3782), the proddried in vacuo at 95 to 100 C. and the pigment so obnets of the invention possess a better fastness to light. tained has a hard texture and cannot readily be sub- The following examples illustrate the invention. Unless divided. The pigment is stirred in 800 parts of nitrobenotherwise stated, the parts and percentages are by weight. zene and heated for 3 to 4 hours at 140 to 145 C. After this period all the coarse and hard particles have disap- Examp 1e 1 10 peared and examination under the microscope shows that 68.4 parts of the dry dyestuif prepa ed from 2 mols O the product consists of small yellow needles of uniform diazotized 4-Chl0rO-3-amin0 enZ C a id and 1 H101 f size. The batch is allowed to cool to 100 C., filtered, and bisacetoacetylamino dichlorobenzene are Stirred the filter residue is washed with hot nitrobenzene and in 1,000 parts of ortho-dichlo enl ne g t W subsequently with methanol until the filtrate runs com- 5 Parts of yl formamide and the batchis heated t 15 pletely colourless. The residue is then dried and a loose, 95 to 100 C. 32.8 parts Of thionyl hl rlde ar un n soft pigment is obtained that can readily be dispersed in during t0 minutes and the batch is heated 2 synthetic materials and lacquer media. It colours polyhOIII'S at 105 10 After the evolution of hydfochlovinylchloride brilliant greenish yellow tints possessing a ric acid has subsided, the batch is allowed to cool to 40 very d f t to migration d 1i h C., the clyestuif carboxylic acid chloride is isolated by E 1 3 suction filtration and washed with 500 parts of cold ortho- Xamp e dichlorobenzene. 203.25 parts of 4 trifluoromethyl 2 (4 chloro- A quantity of the produce still moist with ortho-dichlo- 3 aminobenzoylamino) diphenylether are dissolved robenzene corresponding to 7.21 parts of dry acid chloride in 200 parts of warm glacial acetic acid and the solution is heated in 100 parts of ortho-dichlorobenzene together is run into a solution of 250 parts of hydrochloric with 0.05 part of thionyl chloride to 95 to 100 C., whereacid and 10 parts of the sodium salt of N-benzyl- -heptaupon a solution of 4.1 parts of 2-methoxy-5-trifluorodecyl-benzimidazole disulphonic acid in 100 parts of icemethylaniline and 0.5 part of pyridine in parts of orthowater while stirring. The batch is then diazotized at 0 to dichlorobenzene is added. The batch is stirred for 12 hours 30 5 C. with 125 parts of 4 N sodium nitrite solution and at 140 to 145 C., allowed to cool to 100 C., filtered, and clarified by filtration.

then washed with hot ortho-dichlorobenzene until the 81.5 parts of 5-chloro-2-methyl-1,4-bisacetoacetylfiltrate runs completely colourless. Subsequently, the aminobenzene are dissolved in a mixture of 300 parts of residue is washed with cold methanol and finally with hot 30% sodium hydroxide solution and 2,000 parts of water.

water. When the residue is dried, a loose, soft pigment The two solutions, if necessary, after dilution with water,

is obtained which produces a brilliant, greenish yellow 35 are conducted continuously to a mixing nozzle where tint displaying an excellent fastness to migration and to coupling takes place instantaneously. The pH value in the light when worked into polyvinyl chloride. The pigment mixing nozzle is kept at between 4.5 and 5.5 by regulating so obtained corresponds to the formula the supply of the solutions. The temperature must be OOHQ NHCO Cl Cl CH3 0 F 1 --NHC O--CHN=N CO -N=N-GHC DEN 0 CH3 (:1 Cl CONH es. Example 2 30 C. The temperature can be regulated by the addition of water to the solutions of the components. The 34.5 parts of 4 methoxy 3 (3' amino 4 chloropigment suspension formed is filtered, the filter residue is benzoylamino) 1 trifluoromethylenebenzene are stirred washed free from salt 'with water and then well pressed.

in 150 parts of glacial acetic acid together with 30 parts The press cake is heated for some hours at 100 to 110 C. of 30% hydrochloric acid and the batch is cooled to 5 in 2,000 parts of ortho-dichlorobenzene, during which C. by the addition of 150 parts of ice. 25 parts of 4 N process the major proportion of the water is distilled olf sodium nitrite solution are allowed to run in while stirazeotropically. The batch is then filtered while hot and ring, the temperature being kept at 0 to 2 C. by the addithe filter residue is washed with hot ortho-dichlorobenzene tion of ice. A clear, yellowish solution is obtained from until the filtrate runs clear and colourless. Subsequently, which the diazonium salt eventually precipitates, some of the filter residue is washed successively with cold methanol it in crystalline form. The batch is diluted with ice and and water. It is dried in vacuo at 70 to 75 C. and a water until a clear solution is again formed. Any excess yellow pigment is obtained in good yield which colours of nitrous acid is destroyed by the addition of urea and polyvinylchloride brilliant greenish yellow tints possessthe pH of the diazo solution is adjusted to 4 by the addiing very good fastness to migration and light. tion of 50 Parts of Sodium acetate Crystals- In the following table are listed further components 16.2 parts of 2-chloro 5 methyl 1,4 bisacetoacetylwhich yield pigments by the process described in Examaminobenzene are dissolved in 400 parts of water at 40 ples l to 3. In Column I are listed the diamines from to 45 C. with 30 parts of 30% sodium hydroxide soluwhich the acetoacetic arylides used as coupling components tion, the solution is clarified by filtration with 0.2 part of are derived. In Column I I are listed the aminobenzene blood charcoal, 5 parts of n-butylsulphoricinoleate are carboxylic acids used as the diazo components and in added, and the whole is added dropwise to the diazo solu- Column III the 2-amino-4-trifluoromethylphenyl ethers tion while stirring well. Coupling takes about one hour, used as arylide bases. The tints produced by a 0.2% the temperature of the mixture rising to 20 to 25 C. The colouration in polyvinylchlon'de with the pigments are diazo compound, which can still be clearly detected after indicated in Column IV.

I II III IV Para-phanylenediamino 4-cl1loro-3-amino benzoic acid Q-methoxy-5-trifluoromethylaniline Green' 11 yellow.

d 2-phenoxy-5-trifluoromethylaniline Do. phenylencdiamno do D0. d do. 2-(ortho-methylphenoxy)-5-triflu0r0- D0.

methylaniline. 5 do do 2-(orthwchlorophenoxy)-5trifluoro- Do.

methylaniline. 6 do do 2-(para-chlorophenoxy)-5-trifluor0- D0.

methylaniline. 7 do do 2-(2,4-dichlorophenoxy)-5-triflu0ro- D0.

methylaniline. 8 do do 2-(2,4 -trichl0r0pl1cnoxy)-5-trilluo1'o- D0.

methylaniline. 9 2,5-dichloro-1,4-phenyl0nodiamine do 2-methoxy-5-trifiuoromethylaniline Yellow. 10. do .do.. 2-(n-butoxy)-5-trifluoromethylaniline. Grueuish yellow. 11 do do 2-cyqll9hexy1oxy-5-trifiuoromethyl- Do.

am me. 12 z-methyl-l,4-phenylenediamine do 2-plmnoxy-5-trifluoromethylaniline. D0. 13 do do 2-(pai'a-chlol'ophenoxy)Jrtrilluoro- D0.

methylaniline. 14 2-met hyl-5-chloro-l,4phenylenedi- .d0 2-methoxy-5-trifluoromethylaniline". Do.

2phenoxy-5-trifluoroinethylaniline D0. 2-(ortho-methy1phen0xy)-5-trifluoro- D0.

methylaniline. 17 do do 2-(ortho-chl'arophenoxy)-5trifiu0r0- Do.

methylaniline. l8 do do 2-(para-chlorophenoxy)-5-trifluoro- Do.

methylaniline. 19 do do 2-(2,4"dichlorophenoxy)-5trifiu010- Do.

methylaniline. 20 do do 2-(2,4,5-trichl0r0phen0xy)-5-trifluoro- D0.

methylaniline. 21 do do 2-cyclohexyloxy-5-trifiuoro- Do.

methylaniline. 22 ..d0..... do 2-phenylmercapto-fi-trifluoromethyl- D0.

aniline. 23 do do 2-(para-chlorophenylmercapto)- D0. 5-trilluoromethylaniline. D0. 24 do 4methyl3-amino beuzoic acid 2-phenoxy-5-trifiuoromethylaniline Do. 25 do do 2-(para-chlor0phenoxy)-5-trillu0ro- Do.

methylanilinc. 26 do do". 2-(ortho-chlorophenoxy)-5-tri- D0.

fluoromethylaniline. 27 do 2,4-dicl1loro5-amino benzoic acid 2-phenoxy-5-trifluoromethylaniline D0. 28 do do 2(ortho-methylphenoxy)-5-tri- Do.

fluoromethylaniline. 29 do do 2-(2,4-dichlorophenoxy)-5-tri D0.

fluoromethylaniline. 30 do 4-meth0xy-3-amino benzoic acid z-phelloxy-fi-tllflllolomethylfllllllllO-. D0. 31. .do 2,4-dimethyl-5-amin0 benzoic acid do Do. 32 do do 2-(para-chloroplienoxy)-5-tri- D0.

fluoi'omethylaniline. 33 do 2-amin0terepl1thalic acid-l-methylester do Do. do do 2-phenoxy-5-trifluoromathylaniline- D0. 35 do do 2-(0rtho-methylphenoxy)-5-tri- D0.

fluoromethylaniline. 36 do do 2-methoxy-5-triiluoromethylani1ine Do. do 2-(n-butoxy)-5-trifluoromethylaniline... D0. 38 do do 2-cyclohexyloxy-5-trifiuor0- D0.

methylaniline. 39 do do 2-phenylmercapto-5-trifiuoro- D0.

methylaniline. 40 do do Z-(para-chlorophenylmercapto)- D0.

5-trifiuoromethylaniline. 2methoxy-5-trifluoromethylaniline. Neutral yellow. 2-phenoxy-fi-trifluoromethylanilinc D0. 43 do do 2-(ortho-chlorophenoxy)-5-trifiu0ro- Do.

methylaniline. 44 do do 2-phenylmercapto-5-trilluoromethyl- Greenish aniline. yellow. 45. Z-tgifiuqromethyl-l,4-phe11yl011edo 2-phenoxy-5-trifluoromethylaniline Do.

mmme. 46 do do 2-(ortho-chlorophenoxy)-5-triilu0ro- D0.

methylaniline. 47 do do Z-(para-chlorophenoxy)-5-trifluor0- D0.

methylaniline. 4 do 2,-i-dichloro-5-amino benozoic acid do Do. 49 d0 do 2-methoxy-5-trifluoromethylaniline D0. 50.--" 2-1gethyl-5-methoxy-1,4pl1enyl0nc- 4-chlo1'0-3-amin0 benzoic acid 2-phonoxy-5-trifluor0methyla11i1ine Neutral yellow.

1am1ne. 51 do do 2-(para-chlorophenoxy)-5-trifiuoro- Do.

methylaniline. 52"-.. 2,5-dimethoxy-1,4-phenylenediamine do l. 2-phen0xy-5-trifluoromethylaniline. Yellow. 63 2,5-diethoxy-1,4-phenylenediamine ..do do Redclllish ye 0w. 54 do do 2-para-chlorophenoxy)-5-triflu0ro- Do.

methylaniline. 55 do do 2-(ortho-methylphen0xy)-5-trifiuoro- D0.

methylanillne. 56 4,4-diaminodiphenyl do 2 methoxy-5-trifiuoromethylaniline. Greelrllish ye ow. 57 do do 2-phen0xy-5-trifluoromethylaniline. Do. 58"", 3,3-dimethyl4,4-diaminodiphenyl .do do Do. 59 do "do 2-(para-chlorophenoxy)-5-trifluoro- Greenish methylaniline. yellow 60"... 3,3-dichl01'0-4,4-diaminodiphenyl do do Do. 61. d0 o Z-methoxy-fi-trifluoromethylaniline. D0. 62 do do 2-cycl0hexyloxy5-trifluoromethyl- Do.

aniline. 63 do do 2-(parachlorophenoxy)-5-trifluroo- Do.

methylaniline. 64. 2,S-dichloro-l,4-phenylenediamine amino benzoic acid 2-phenoxy-5-trifluoromethylanilinm Do. 65 do 3-nitr0-4-amino benzoic acid d Do. 66- 2'cyano-1,4-phenylenediamine. 4-chloro-3-amino benzoic acid- ,do Do. 67.". 2-methyl-5-chloro-lA-phenylenedo 4-methoxy-5-trifluoromethylaniline Do.

diamine.

d 4-phgnoxy-5-triiluoromethylaniline I II III IV 71- 2-chlor0-1,4-pheny1enedian1ine 4=chloro-3-amino-benzoie acid 4-phen0xy-5-trii1uoromethylani1ine Greenish yellow.

- 2-methoxy-5-ehbm-1,4-phenylene- .do ..do Yellow.

diamine. 73- 2-methy1-5-methoxy-1,4-phenylenedo ..do Reddish yellow.

diamine. 2,5'dimethoxy-1,4-phenylenodiamine .do do Orange. 1,3-phenylenediamine .do. 2-phen0xy-5-trifiuoromethylaniline Neutral yellow. 76. 2,4-dicliloro-1,3-phenylenedian1iue do 2-(para-ehlorophenoxy)-Mrifluoro- Greenish yellow.

methylaniline. 77- 2,4 dimethyl-1,3-phe11ylenediamine ..d0 do Neutral yellow. 78- 2-chloro-5-methy1-1,4-phenylene- .do 2(para-bromophenoxy)-5-trifluoro- Greenish yellow.

. methylaniline. 79 ..do ..do 2-(para-methoxyphenoxy)-5-trifluoro- Do.

methylaniline. 80 do. do 2-para diphenyloxy-dtrifluoromethyl- Do.

am e. 81 .do. do. 2-(a-nephthoxy)-5-trifiuoromethyl- Do.

an ne. 82 (10.- do 2-(fi-nlaphthoxy)-5-trifluoromethy1- Do.

8H1 1119. 83. 2,5-dichloro-1,4-pheny1enediamine do 4-metboxy-3-trifluoromethylaniline Yellow. 84 do. do. 4-phenoxy-3-trifiuoromethylaniline. Greenish yellow 85 do. do. 4-(2ghlorophenoxy)-3-trifluoromethyl- Do.

an me. 86 do. do. 4(4-methylphenoxy)-3-trifluoro- Do.

methylaniline. 87. 2-ehloro-1,4-pheny1enediamine do" 4-methom 3-trifiuoromethy1aniline- Do. 88 do. do. 4-phenoxy-S-trifluoromethylaniline Do. 89 d0. do 4-(4'- t1: hlorophenoxy)-3-trifiuoromethyl. Do.

am me. 90"-.- 2-%hloro-fi-methyl-l,4-phenylene- ..do 4-methoxy-3'trifluoromethylaniline-- Do.

iamme. 91 dodo. 4-phenoxy-3-trifluoromethylaniline. Do. 02 do. do 4-(2 -methylphenoxy)-3-trifiuoro- Do.

methylaniline. 93 2,5-dimethyl-lA-phenylenediamine do .do Yellow.

. ---do do. 4-phenoxy-3-trifiuoromethylaniline. Greenish yellow. 3,3-dimethoxy-4,4-diamino-6,6- do ..d0 Neutral yellow.

diohlorodiphenyl. 97 do do 2-phenoxy-fitrifluoromethylaniline. Do.

What is claimed is: mercapto groups and the other Z is hydrogen and n is a 1. A disazo-pigment of the formula in which A is an 35 number from 1 to 2.

CFa CFB CONH Z at most bicyclic unsubstituted arylene radical or substi- 50 2. A disazo-pigment as claimed in claim 1 of the tuted by chlorine atoms, lower alkyl, lower alkoxy and formula or R; c 0 NH z o 0 CH 1 N=NCHCONH OFa 0 F3 NHC o CH-N=N- I J: 0 0 CH3 z1 HN 0 R1 trifluoromethyl groups, Y a member selected from the 7 in which R; and R are members selected from the group group consisting of hydrogen and chlorine atoms, lower al-kyl and lower alkoxy groups, one Z is a member selected from the group consisting of lower alkoxy, cyclohexylalkoxy, phenoxy, chlorophenoxy, brovmophenoxy consisting of hydrogen and chlorine atoms, lower alkyl, lower alkoxy and trifiuoromethyl groups, one Z is a member selected from the group conesisting of p'henoxy, chlorophenoxy and lower al'kyl-phenoxy radicals and the lower alkyl-phenoxy, lower alkylmercapto and phenyl- 75 other Z is hydrogen.

1 l 1 2 3. The dyestuff as'claimed in claim 1 of the formula N=N(I3HC 0 NH- ('31 coom 01- NH 0 0 (IJHN:N

| COCHa NHCO 01 oc1 CONH- 4. The dyestuff as claimed in claim 1 of the formula Cl CH;

(:1 N=N-CHCONI-I G1 5. The dyestufi as claimed in claim 1 of the formula 6. The dyestulf as claimed in claim 1 of the formula CH3 N:NCHC OHN (ll CONII I CF;

7. The dyestuff as claimed in claim 1 of the formula Cl CH3 I COCH:

N=N-CI-ICOHN Cl C 0 CH3 HNCO G1 3,413,279 13 14 8. The dyestuff as claimed in claim 1 of the formula C1 CH:

COCH:

COCHI HNCO CHaO C O NH- 0 F a OCI'I3 References Cited UNITED STATES PATENTS 2,984,660 5/1961 Rib'ka 260176 CHARLES B. PARKER, Primary Examiner. D. M. PA-PUGA, Assistant Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,413,279 November 26, 1968 Willy Mueller It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 10, line 73, "conesisting" should read consisting Columns 11 and 12 claim 4, the lower-right hand portion of the formula should appear as shown below:

CONH Cl same columns 11 and 12, claim 7, the lower right-hand portion of the formula should appear as shown below:

CONH

Signed and sealed this 17th day of March 1970.

(SEAL) Attest:

EDWARD M.FLETCHER,JR.

Commissioner of Patents 

